Our family is like this
I finally gave up and placed a call to my sister:
"Do you have any long, flowing skirts?"
My sister is a percussionist. She never wears skirts.
"I think Mum might have some somewhere."
"Great. I'll be over in a few minutes. Oh, and make sure I can see your elbows: I need to know how your arms bend."
To the credit of both my sisters, my other sister's friend, and my mother, nobody batted an eyelid when I turned up with my camera and started taking pictures:
"No, lift your head up. I need to see your face, so just be looking with your eyes. And show more ankle. Really lift that skirt up."
click
"OK, no, lift that arm up, and kind of point, like there's a bird perching on your finger. Yeah. And imagine mice are watching you."
click
"OK, awesome. See you tomorrow."
It's much easier to draw complicated poses with reference shots.
Results later, maybe.